
// 三、基于下面提供的代码，完成后续的四个练习
// support.js
class Container{
  static of(value){
    return new Container(value)
  }
  constructor(value){
    this._value = value;
  }
  map(fn){
    return Container.of(fn(this._value))
  }
}
class Maybe {
  static of(x){
    return new Maybe(x)
  }
  isNothing(){
    return this._value === null || this._value === undefined
  }
  constructor(x){
    this._value = x
  }
  map(fn){
    return this.isNothing() ? this : Maybe.of(fn(this._value))
  }
}

module.exports = { Maybe, Container}